Corrigendum: Fluorescent Mimetics of CMP‐Neu5Ac Are Highly Potent, Cell‐Permeable Polarization Probes of Eukaryotic and Bacterial Sialyltransferases and Inhibit Cellular Sialylation. Issue 31 (28th July 2014) - Preidl, Johannes J.; Gnanapragassam, Vinayaga S.; Lisurek, Michael; Saupe, Jörn; Horstkorte, Rüdiger; Rademann, Jörg